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MapSpline Class

Draws a spline on the map.

Namespace: DevExpress.Xpf.Map

Assembly: DevExpress.Xpf.Map.v21.1.dll

Declaration

public class MapSpline :
    MapPolylineBase

The following members accept/return MapSpline objects:

Remarks

The Map Control uses vector layers to display vector items such as map splines.

The following image shows a spline that is plotted based on four geographical points.

Create a Map Spline

Design Time

The code below creates a MapSpline and adds it to a vector layer’s item storage:

<dxm:MapControl x:Name="mapControl1">
    <dxm:VectorLayer DataLoaded="VectorLayer_DataLoaded">
        <dxm:MapItemStorage>
            <dxm:MapSpline>
                <dxm:MapSpline.Points>
                    <dxm:GeoPoint Latitude="64.1" Longitude="-40.5"/>
                    <dxm:GeoPoint Latitude="65.4" Longitude="-33.8"/>
                    <dxm:GeoPoint Latitude="64.5" Longitude="-28.5"/>
                    <dxm:GeoPoint Latitude="65.5" Longitude="-24.5"/>
                </dxm:MapSpline.Points>
            </dxm:MapSpline>
        </dxm:MapItemStorage>
    </dxm:VectorLayer>
</dxm:MapControl>

Code-Behind:

using DevExpress.Xpf.Map;
using System.Windows;

namespace MapSplineExample {
    public partial class MainWindow : Window {
        // You can call the MapControl.ZoomToFitLayerItems method in the DataLoaded event handler
        // to zoom the map so that it displays all vector items according to their bounding box.
        private void VectorLayer_DataLoaded(object sender, DevExpress.Xpf.Map.DataLoadedEventArgs e) {
            mapControl1.ZoomToFitLayerItems(new LayerBase[] { mapControl1.Layers[1] });
        }
    }
}    

Runtime

The code below creates a map spline at runtime:

private void Window_Loaded(object sender, RoutedEventArgs e) {
    MapItemStorage storage = new MapItemStorage();
    vectorLayer1.Data = storage;
    MapSpline spline = new MapSpline {
        Points = new CoordPointCollection {
            new GeoPoint(64.1, -40.5),
            new GeoPoint(65.4, -33.8),
            new GeoPoint(64.5, -28.5),
            new GeoPoint(65.5, -24.5)
        }
    };
    storage.Items.Add(spline);
    vectorLayer1.DataLoaded += VectorLayer_DataLoaded;
}
// You can call the MapControl.ZoomToFitLayerItems method in the DataLoaded event handler
// to zoom the map so that it displays all vector items according to their bounding box.
private void VectorLayer_DataLoaded(object sender, DevExpress.Xpf.Map.DataLoadedEventArgs e) {
    mapControl1.ZoomToFitLayerItems(new LayerBase[] { mapControl1.Layers[1] });
}

You can add multiple MapSplines to a vector layer. For more information on how to load vector items to a map, see the Providing Data topic.

Customize Spline Appearance

Use the following properties to specify spline color and style at normal, highlighted and selected states.

State

APIs

Normal

MapShapeBase.Stroke, MapShapeBase.StrokeStyle

Highlighted

MapShapeBase.HighlightStroke, MapShapeBase.HighlightStrokeStyle

Selected

MapShapeBase.SelectedStroke, MapShapeBase.SelectedStrokeStyle

The following example shows how to create a red dashed spline. When the spline is highlighted or selected, its color is changed to blue/black respectively.

<Window.Resources>
      <ResourceDictionary>
          <dxm:StrokeStyle x:Key="MapSplineStyle" DashArray="4 2" Thickness="4" />
      </ResourceDictionary>
</Window.Resources>
<Grid>
...
        <dxm:MapSpline Stroke="Red" 
                       HighlightStroke="Blue" 
                       SelectedStroke="Black" 
                       StrokeStyle="{StaticResource MapSplineStyle}"
                       HighlightStrokeStyle="{StaticResource MapSplineStyle}"
                       SelectedStrokeStyle="{StaticResource MapSplineStyle}">
            <dxm:MapSpline.Points>
                <dxm:GeoPoint Latitude="64.1" Longitude="-40.5"/>
                <dxm:GeoPoint Latitude="65.4" Longitude="-33.8"/>
                <dxm:GeoPoint Latitude="64.5" Longitude="-28.5"/>
                <dxm:GeoPoint Latitude="65.5" Longitude="-24.5"/>
            </dxm:MapSpline.Points>
        </dxm:MapSpline>
...
</Grid>

Add Spline Caps

You can display shapes at the beginning and at the end of splines. Use StartLineCap and EndLineCap properties for this purpose. The following example specifies a custom end cap shape, shows the default arrow for the MapSpline start cap, and sets their dimensions:

Map Spline Caps

<dxm:MapSpline Stroke="Blue">
   <dxm:MapSpline.StrokeStyle>
       <dxm:StrokeStyle Thickness="3"/>
   </dxm:MapSpline.StrokeStyle>
   <dxm:MapSpline.Points>
       <dxm:GeoPoint>-6, -4</dxm:GeoPoint>
       <dxm:GeoPoint>-3, -10</dxm:GeoPoint>
       <dxm:GeoPoint>-6, -20</dxm:GeoPoint>
   </dxm:MapSpline.Points>
   <dxm:MapSpline.StartLineCap>
       <dxm:MapLineCap Visible="True" Length="21" Width="11"/>
   </dxm:MapSpline.StartLineCap>
   <dxm:MapSpline.EndLineCap>
       <dxm:MapLineCap Visible="True" Length="14" Width="7">
           <dxm:MapLineCap.Geometry>
               <PathGeometry Figures="M 0, 0 L 0,-0.5 L 0.5,-0.5 L 0.5, 0.5 L 0,0.5 Z "/>
           </dxm:MapLineCap.Geometry>
       </dxm:MapLineCap>
   </dxm:MapSpline.EndLineCap>
</dxm:MapSpline>
See Also